They only did one single chamber, but there is a LOT of air space to play with if you're able to go with fiberglass.
The floor really wasn't raised much at all, maybe 1/4 of an inch at most and that was only due to the panel on top used to make sure the entire floor was covered. The finishing panel is 1/2" MDF and sits in the same place as the stock carpeting.
It was a tight fight, though. The box is 3/4" MDF and the subs have a mounting depth of 6 3/4". You have about 8" from the lowest point to work with to maintain stock height.
They cut out a hole in the middle and built a pedestal in the box to go around the mounting for the spare tire.
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